The chest options are not refreshing with this latest patch. Just spent 500 crystals with no items refreshed. Currently on fit tower. Not sure if anyone else is having problems.
Sometimes it refresh only one item & it’s so difficult to notice that there was a refresh. I wasted my crystals there too 
@marspark What is a likelihood to get almost identical shop (often it’s only one top item that changes after refreshing) when you refresh 5 items?
I’ll have to check it after the holiday, but as you said the refreshed items are much more likely to be similar/same than the other shops.